diff --git a/CMakeLists.txt b/CMakeLists.txt
index 80cb2b7..7a13564 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,8 +3,8 @@ cmake_minimum_required(VERSION 3.14)
 set(VERSION "0.4.1")
 project(cpuid LANGUAGES C CXX ASM VERSION ${VERSION})
 
-set(CMAKE_CXX_STANDARD 20)
-set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_C_STANDARD 99)
 
 add_subdirectory(libcpuid)
 add_subdirectory(cpuid_tool)
\ No newline at end of file